ATK Engines HP89 Small Block Chevy 350 Base Engine, 390HP

ATK Engines HP89 Small Block Chevy 350 Base Engine, 390HP

The HP89 is a street-oriented 350 cubic-inch crate engine with a noticeable performance idle and strong usable power. It is rated at 390 HP and 420 lb-ft of torque.

Specifications

• 350 cubic inches
• 390 HP / 420 lb-ft torque
• OE roller block, four-bolt main, one-piece rear main seal, 1996–2000 style
• 4.040 x 3.480-inch bore/stroke
• OE-reconditioned crankshaft
• 5.7-inch powdered-metal rods
• 10:1 hypereutectic pistons
• Hydraulic roller cam, 220/224 at .050-inch, .528/.536 lift, 110 LSA
• ATK aluminum heads with 2.020/1.600 valves
• Billet aluminum 1.6:1 roller rockers

Recommended Components

The listing recommends an ATK dual-plane intake, HEI distributor, OE long water pump, Quick Fuel 680 CFM carburetor, Holley mechanical fuel pump, Autolite 3923 plugs and 8mm wires. Recommended timing is 34–36 degrees and fuel is 91+ octane.

The listing identifies the engine as a long-block configuration and notes that carburetor, intake, distributor, water pump and other accessories are not necessarily included. Confirm package contents and vehicle fitment before ordering.